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Homework Help: IUPAC nomenclature

  1. Jul 28, 2012 #1
    1. The problem statement, all variables and given/known data
    Give the IUPAC name of the following compound

    OH  Cl
    |   |
    (Note:Hydrogen atoms are not drawn)

    2. Relevant equations

    3. The attempt at a solution
    Model answer:3-chlorobutane-1,2-diol
    Why it is called 3-chlorobutane-1,2-diol instead of 3-chlorobutan-1,2-diol?
    Consider CH3CH2CH2OH,it is propan-2-ol,where "e" from "propane" is dropped.
    So e from 3-chlorobutane-1,2-diol should also be deleted?
  2. jcsd
  3. Jul 28, 2012 #2
    Aside from the fact that CH3CH2CH2OH is propan-1-ol, I have seen both names with an e on the end and not. Sometimes it's a language thing - German for instance tends not to have them. Is this the case here?
  4. Jul 28, 2012 #3
    It's a convention while naming the compounds. For instance, in propan-2-ol, the 'e' is dropped because there's a vowel next to 'e', that is 'o'. If it was a consonant, we would not have dropped the 'e' as it is the case with 3-chlorobutane-1,2-diol as 'd' isn't a vowel.
  5. Jul 29, 2012 #4
    Thx a lot.But do you know the reasons of it?
  6. Jul 29, 2012 #5
    Ahh, of course, thanks Pranav-Arora. As to why, it's probably along the lines of making things easier to say, with elided vowels etc
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